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A-level Chemistry y1 > 14:Halogens > Flashcards

14:Halogens Flashcards

1
Q

What is the appearance of chlorine at room temperature

A

Green/yellow gas

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2
Q

What is the appearance of bromine at room temperature

A

Red-brown liquid giving off a brown vapour

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3
Q

What is the appearance of iodine at room temperature

A

Grey/black solid (which on gentle heating, vapourises to form a purple gas)

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4
Q

How does reactivity change going down group 7

A

Reactivity decreases

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5
Q

What colour is aqueous solution and cyclohexane layer of chlorine

A

Aqueous solution: Pale yellow

Cyclohexane: Pale yellow

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6
Q

What colour is aqueous solution and cyclohexane layer of Bromine

A

Aqueous solution: Orange

Cyclohexane: Orange

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7
Q

What colour is aqueous solution and cyclohexane layer of Iodine

A

Aqueous solution: Brown

Cyclohexane: Purple

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8
Q

What colour precipitate does chlorine form when reacting with silver ions

A

White precipitate

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9
Q

What colour precipitate does bromine form when reacting with silver ions

A

Cream precipitate

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10
Q

What colour precipitate does Iodine form when reacting with silver ions

A

Yellow precipitate

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11
Q

Does silver chloride dissolve in dilute or concentrated aqueous ammonia

A

Dilute and conc

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12
Q

Does silver bromide dissolve in dilute or concentrated aqueous ammonia

A

Concentrated only

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13
Q

Does silver iodide dissolve in dilute or concentrated aqueous ammonia

A

Niether

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14
Q

What is the reaction between aqueous chlorine with water

A

Cl₂(aq) + H₂O(l) → HCl(aq) + HOCl(aq)

Disproportionation reaction

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15
Q

What is a disproportionation reaction

A

The same element is simultaneously oxidised and reduced

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16
Q

Why do some people have concerns about the use of chlorine in water treatment

A
  • Chlorine itself is highly toxic
  • Chlorine can also react with traces of organic compounds in water, producing organochlorine compounds, some of which are known as carcinogens
17
Q

Reaction of aqueous chlorine and cold, dilute aqueous sodium hydroxide

A

Cl₂(aq) + 2NaOH(aq) → NaCl(aq) + NaClO(aq) +H₂O(l)

18
Q

Why is the reaction of chlorine and cold, dilute aqueous sodium hydroxide commercially used

A

Produces NaClO sodium chlorate(I) which is bleach

A-level Chemistry y1 (26 decks)

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